Thread: Question on balancing rotating assembly.

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I bought a SCAT9000 crank new that is already balanced. I am looking at a set of EAGLE rods that are already balanced. So if this is the case should you still take all of the peices to the machine shop and have them re balanced or just things like the pistons, balancer, fly wheel etc? The machine shop also asks for one complete main and rod bearing as well as one piston with the ring installed. Would one of you clear this up a little for me.

Thanks
Wade

If your machine shop doesn't ask for ALL rotating parts, then find a new shop fast!!!

They should want crankshaft, rods, pistons, pins, balancer, flywheel (or flexplate), pressure plate, and rod bolts.

If they ASSUME that all rods and all pistons weigh equally without actually checking them, you need to shop for a new machinist.

Even the rods themselves should be beam balanced for big-end and small-end weights.

BlackRat check my post on engine balancing a couple of threads up, it should explain the process a little better.